[MC/Darwin] Fix a -Wmisleading-indentation warning, reported by GCC 6.

llvm-svn: 274563
diff --git a/llvm/lib/MC/MCParser/DarwinAsmParser.cpp b/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
index a871b31..7b9f822 100644
--- a/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/DarwinAsmParser.cpp
@@ -959,8 +959,8 @@
     if (getLexer().isNot(AsmToken::Integer))
       return TokError("invalid OS update number");
     Update = getLexer().getTok().getIntVal();
-  if (Update > 255 || Update < 0)
-    return TokError("invalid OS update number");
+    if (Update > 255 || Update < 0)
+      return TokError("invalid OS update number");
     Lex();
   }